Baramine Project - Manganese
Shaw River holds a 70% interest in the manganese and iron rights in three Pilbara tenements at Baramine, located 80km north west of the producing 'Woodie Woodie' Manganese mine which has a current mining resource of 15 million tons of Manganese ore grading 41% Mn.
The tenements are considered highly prospective for manganese and are known to be located on identical geology to the manganese occurrences at Woodie Woodie to the south.
Following the discovery in 2008 of over 100 separate high grade (up to 58.5%Mn) outcrops, Shaw River has completed three successful drilling programs since March 2009. A total of 257 drillholes have identified 90 mineralised manganese intersections (>10%Mn, >2m) and 18 separate prospects areas have been identified. To date drilling has tested only 11% of the identified 35km strike potential.
Shaw River secured a $150,000 Western Australian Government co-funding grant to help fund the company's exploration RC drilling campaigns beginning in July 2010 at Baramine.
The project is strategically located 300km east from one of the world's largest bulk ports, Port Hedland, in the Pilbara region of Western Australia in a world class manganese field.
The Baramine Project, contains geological rocks of the Archaean age Hammersley Basin. Within the Hammersley Basin, manganese mineralization is associated with the occurrence of the Carawine Dolomite and Pinjian Chert. The world class 'Woodie Woodie' Manganese Project, located 80km to the south east (operated by Consolidated Minerals Pty Ltd) is an example of the style of deposit that Shaw River is exploring for within the project area.
Geological mapping by Shaw River has determined the project area covers an identical geological sequence to 'Woodie Woodie', in the core of an open north-south trending syncline. The Pinjian Chert and Carrawine Dolomite sits, with apparent conformity, on sediments and andesitic volcano-sediments assigned to the Jeerinah Formation. The dolomite and chert form a range of locally rugged hills that protrude about 75 metres above the underlying Jeerinah Formation sediments.
Occurrences of manganese hosted are principally hosted within or along the contact between the Carawine Dolomite and Pinjian Chert, and cross cutting faults and fractures are considered to be an important control in the development of significant accumulations of manganese mineralization.
Manganese mineralization has been traced over a distance of 17km within the prospective units, and there is potential that these units continue for up to 23km to the NW under cover of the Canning Basin sediments.
The reinterpretation of airborne EM surveys and gravity resulted in the identification of forty exploration targets.
A detailed and regional soil sampling program was completed to identify near surface zones of manganese enrichment that correlate with structures. This proved very effective and accurate, reinforcing the Company's understanding of the manganese mineralisation model at Baramine.
In total 86 RC holes were drilled for a total of 10,308m during 2011. This brings the total number of RC holes drilled at Baramine to 343 for a total of 27,578m.
Drilling results achieved during the2010/2011 drill programs strongly supported previous drilling and increased the number of mineralised intersections and zones identified at the Project. The best intersections for the period are included in Table 1.
Table 1 Significant Manganese RC Drill Intersections, Current Program, Baramine.
Vertical and angle holes. RC drilling samples, riffle split, 2-5kg samples, Analysis by X-Ray Fluorescence. Cutoff grade used for significant intersections: Greater than 15%Mn
Drilling and soil sampling have now defined an area known as Area 3 & 4 as having significant manganese mineralisation. The zones of mineralisation at these two prospects form part of an intense alteration corridor associated with a single North- South structural contact and associated North East - South West splay structures. Surface manganese alteration has been identified conforming with this zone, which reaches up to 700m wide in places (150m on average) and can be traced for 4km.
The style of manganese mineralisation identified by the current drilling at Baramine is high grade plunging shutes in a more coherent zone of +10%Mn and is very similar in nature to many of the deposits at the nearby Woodie Woodie Mine (56 deposits mined over 50 years, average tonnage 500,000 tonnes, grade 40%Mn).
Shaw River is seeking to define large-scale manganese resources at Baramine to pave the way for a long-life mining operation.
- Modeling and interpretation of successful drilling at Baramine and the development of a detailed geological model for resource estimation and economic modeling.
- Additional beneficiation test work to be conductedusing bulk sampling and drilling.
- Infill drilling to follow up the identified
4.5km structural and geochemical target zone which has indicated well developed Woodie Woodie style manganese mineralisation.